A099203 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A099203

Integers divisible by 7 which are sequentially obtained from the decimal expansion of sqrt(2) = 1.4142135...

14, 14, 21, 35, 623, 7, 30950488016, 88724209, 6980785, 69671, 875, 37694807317667973799073247846210703885038753432, 7, 641572735013, 84, 623, 0, 91, 229702492483605585073, 7, 21, 264412149709993583141322266592, 7, 50559275579995, 0, 50115278206, 0, 571470109

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..28.

EXAMPLE

a(3)=21 because it is the first integer divisible by 7 which is obtained from the beginning of the unused part of the decimal expansion of square root 2.

PROG

(PARI)

SeqDigits(v, pred)={my(L=List(), k=1); for(i=1, #v, my(t=fromdigits(v[k..i])); if(pred(t), listput(L, t); k=i+1)); Vec(L)}

{ localprec(400); SeqDigits(digits(floor(sqrt(2)*10^250)), t->t%7==0) } \\ Andrew Howroyd, Nov 06 2019

CROSSREFS

Cf. A002193, A099205.

Sequence in context: A157427 A003905 A205702 * A040183 A022348 A214463

Adjacent sequences: A099200 A099201 A099202 * A099204 A099205 A099206

KEYWORD

nonn,base,less

AUTHOR

Serhat Sevki Dincer (mesti_mudam(AT)yahoo.com), Oct 04 2004

EXTENSIONS

Terms a(9) and beyond from Andrew Howroyd, Nov 06 2019

STATUS

approved